Borosil Scientific Burettes are made of heavy walled 3.3 borosilicate glass tubings, with precise bore sizes to provide highest accuracy even after repeated usage. The Class B AutoBurettes are individually calibrated as per ISO standard and supplied with individual calibration certificate which can be easily downloaded from the website. The burettes with Boroflo stop cock have PTFE keys which provide best drop control during the titration process. Autoburettes can be easily refilled from the attached reservior thus making the process of titration hassle free.